On: "In every study that considered the question"

[mrandish]

Great article, which I strongly agree with. Another reason I've personally seen for over-reliance on icons instead of text is it's an easier, cheaper way to satisfy localization requirements.

[FabHK → mrandish]

Disagree. It's very simple - you have zero (off), half (parking), and fully on. It's naturally in that order, and the icons are irrelevant.